diff --git a/Lecture5/requirements.txt b/Lecture5/requirements.txt
index 70bab6d..05137d3 100644
--- a/Lecture5/requirements.txt
+++ b/Lecture5/requirements.txt
@@ -23,7 +23,7 @@ jupyterlab-server==1.0.6
 kiwisolver==1.1.0
 MarkupSafe==1.1.1
 matplotlib==3.1.2
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==8.1.0
 nbconvert==5.6.1
 nbformat==5.0.4